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J. E. ENGSTAD.

INHALER.

APPLICATION FILED JAN. 25. m5.

Patented Aug. 1, 1916.

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flid Q 914 JOHN E. ENGSTAD, OF MINNEAPOLIS, MINNESOTA.

INHALER.

Specification of Letters Patent.

Patented Aug. 1, 1916.

Application filed January 25, 1915. Serial No. 4,127.

To all whom it may 0012061 12 Be it known that I, JOHN E. ENGSTAD, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Inhalers, of which the following is a specification.

My invention relates to inhalers for administering anesthetic, and has for its object to provide an inhaler wherein the mask frame for holding the cloth which receives the anesthetic, such as ether, is provided with heating means so that the cloth and the anesthetic upon the same is heated as it vaporizes, thus neutralizing the loss of heat due to rapid evaporation of the anesthetic. This largely reduces the unpleasantness of taking the anesthetic and increases the efiiciency of the anesthetic and the rapidity with which the patient is brought under its influence. It also obviates the danger of in jury from the breathing of air and vapor too greatly chilled by evaporation, which, as is known, 1s a frequent cause of a form of pneumonia which follows the use of certain anesthetics such as ether.

In the construction of my device I provide a mask frame in which the elements thereof comprise a portion of a tube properly coiled so as to support the cloth and at the same time form a continuous passage way for permitting a flow of warm liquid, such as water, through the same. The ends of this tube are placed in communication with a circulating system, and while the apparatus is in use water of the desired temperature is kept flowing through the pipe with the result that the interior of the inhaler and the cloth upon the same which receives the anesthetic are heated and the patient breathes a suitably warmed mixture of gases, which produces the desired results above enumerated.

The full objects and advantages of my invention will appear in connection with the detailed description thereof and are particularly pointed out in the claims.

In the drawings, illustrating the application of my invention in one form,Figure 1 is a plan view of an inhaler embodying my invention. Fig. 2 is a sectional side view of the same. Fig. 3 is a detail sectional view. 1

As illustrated, the inhaler comprises a base ring 10 of semicylindrical metal shape to fit the face of the patient and adapted to receive on the inside a clasp ring 11 for engaging and holding the cloth 12 in position to provide the mask. The ring 10 has secured thereto, preferably in planes at right angles to each other, a pair of semicircular arms 13 and 1e, which arms pass one above the other in arched fashion and are preferably secured" together at their meeting point 15 by solderv or other means, as desired.

A tube 16 is secured at 17 to the frame member 13 and is thereafter carried in a series of coils 18 upon the outside of frame members 13 and 1 1 so as to form a shaped framework or support for the cloth mask 12, each of coils 18 being secured to the frame pieces 13 and 14 at each point of crossing of said coils. veniently done by means of solder. From the last of coils 18 the tube is carried beneath frame member 14 and beneath the coils 18, to each of which it is secured at its point of crossing, into an extension 19. Pipe extensions 16 and 19 are provided with cocks 20 and are connected by means of tubing 21 and 22 with a means of supplying a hot liquid, such as hot water, which is caused to circulate through the coils 18, entering preferably through pipe 19 and discharging through pipe 16. The base ring 10 has secured thereto a lug 23 which carries a handle 24:.

The operation of my device will be apparent. In use a cloth or mask 12 of the usual form is secured in the usual manner by ring clip 11 so that the same is extended over and shaped by the frame formed of the coils 18. Hot water is then. caused to cir- I culate through the coils and the mask is applied to the patients face. There is thus formed a chamber closed on the outside by the mask having a series of hot pipes extending about the outer wall thereof. This will of itself immediately raise the temperature of the interior of said chamber. Furthermore, the heating members are directly in contact with the mask. It follows, therefore, that when the anesthetic is poured upon the cloth mask it comes in contact more or less with the hot pipes and the heat of the pipes is conveyed to the mask, which greatly increases the rapidlty of evaporation. The heat for such evaporation is pro-- vided by the circulating medium within the coils of the pipe and such evaporation takes place without reduction of temperature with This securing may be conin the mask. The patient thus receives the anesthetizing gas more rapidly than other- Wise would be possible and at a temperature which renders it relatively pleasant to inhale, and Which obviates the dangers incident to the inhalation of very cold gas at a time When the organs of the body are becoming relaxed, due to the development of anesthesia.

I claim:

1. An inhaler comprising a base ring and means for securing a cloth mask thereto, and a frame for positioning said mask consisting of a series of coils of a tube, said tube being provided With connections for supplying a hot circulating medium as hot Water so that the temperature Within the inhaler is raised and heat for evaporating the anesthetic is applied directly to the mask.

2. An inhaler comprising a base ring, a coiled tube attached to said base ring and forming a mask frame, the convolutions of said tube being spaced from each other, and a cloth mask covering said tube and secured to said base.

In testimony whereof I ailix my signature in presence of two Witnesses.

JOHN E. ENGSTAD.

Witnesses H. A. BOWMAN, F. A. WVHITELEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of E's/tents. Washington, D. C. 

